/usr/share/doc/m4/examples
Edit: /usr/share/doc/m4/examples/indir.m4 (285B)
define(`%%$$##', `>>>$0<<< cnt $#')
# indir(`%%$$##', nonsens, nonsens)
indir(`%%$$##', nonsens, nonsens)
# indir(`indir', `%%$$##', nonsens)
indir(`indir', `%%$$##', nonsens)
# indir(`indir', `indir', `indir', `indir', `%%$$##')
indir(`indir', `indir', `indir', `indir', `%%$$##')